20,746 research outputs found
Hybrid Quasicrystals, Transport and Localization in Products of Minimal Sets
We consider convex combinations of finite-valued almost periodic sequences
(mainly substitution sequences) and put them as potentials of one-dimensional
tight-binding models. We prove that these sequences are almost periodic. We
call such combinations {\em hybrid quasicrystals} and these studies are related
to the minimality, under the shift on both coordinates, of the product space of
the respective (minimal) hulls. We observe a rich variety of behaviors on the
quantum dynamical transport ranging from localization to transport.Comment: 3 figures. To appear in Journal of Stat. Physic
Influência da adubação nitrogenada e potássica na podridão de colmo do milho por antracnose (Colletotrichum graminicola) em duas cultivares de milho
Trabalho apresentado no 42º Congresso Brasileiro de Fitopatologia, 2009, Rio de Janeiro, RJ
Importância da adubação nitrogenada e potássica na incidência de colmos podres por antracnose (Colletotrichum graminicola) e a sua relação com o peso de grãos em duas cultivares de milho.
Trabalho apresentado no 42º Congresso Brasileiro de Fitopatologia, 2009, Rio de Janeiro, RJ
Dissipative quantum systems modeled by a two level reservoir coupling
The coupling between a quantum dynamical system and a two-level system
reservoir is analysed within the framework of the Feynman-Vernon theory. We
stress the differences between this new reservoir and the well-known bath of
oscillators and show that, in order to obtain the Langevin equation for the
system of interest in the high temperature regime, we have to choose a spectral
distribution function which is finite for .Comment: 6 pages, RevteX, preprint UNICAM
Análise econômica da adoção da mecanização e adubação na cultura de arroz e caupi em Altamira - Pará.
bitstream/item/57395/1/Altamira-CirTec4.pd
Avaliação preliminar do desempenho operacional e econômico de dois tipos de colheitadeira de algodão.
bitstream/CNPA-2009-09/18299/1/CIRTEC39.pdfProdução CientÃfica
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